Is it possible to edit a layered .gif file in Camtasia to then export that file into a new .gif file, and keep existing .gif sequencing?

I want to make a video using Camtasia, showing its possible to use Snagit to annotate .gif files. This would only be possible knowing that I could import flattened .gif files, that retain their active .gif sequences. Then, in turn, be able to export another video sequence either .gif or .mp4 screencast from Camtasia.

Is it possible to edit in this way or does one have to do it some other way?